2019-09-15T10:14:53ZContribution of selected lichens species of the genus Cladonia on the heathlands in Toruń (N, Poland)https://repozytorium.umk.pl:443/handle/item/5329
Contribution of selected lichens species of the genus Cladonia on the heathlands in Toruń (N, Poland)
Adamska, Edyta; Filbrandt-Czaja, Anna; Richert, Agnieszka
The study presents data on the distribution of selected species of lichens – Cladonia furcata (Huds.) Schrad. , C. rangiferina (L.) Weber ex F.H. Wigg. and C. uncialis (L.) Weber ex F.H. Wigg. in Toruń and along its southern boundary - on a heathland on the military training ground. A comparison was carried out of the research findings on the occurrence of the analysed species against variable habitat conditions over a period of nearly 40 years. The occurrence of Cladonia uncialis was most frequently observed within the city, in the habitats of Calluna vulgaris . A tendency was shown of selected lichen species to spread in the investigated area.
2018-03-15T00:00:00ZEffect of substrate change on macrozoobenthos structurehttps://repozytorium.umk.pl:443/handle/item/5261
Effect of substrate change on macrozoobenthos structure
Mimier, Daria; Żbikowski, Janusz
The aim of the study was to determine the impact of the increase in the organic matter content in the bottom sediments on the benthic fauna structure. The research was carried out in a strongly rheolimnic the Włocławek Dam Reservoir (Poland). The samples were taken on eight dates from March 1988 to February 1989. The sampling sites were located at the following depths: 1 m, 2 m, 5 m, 8 m and 10 m. The organic matter content in the bottom sediments increased with depth from 0.6% at a depth of 1 m to 13.2% at a 10 m depth. To a depth of 8 m, the bottom fauna was relatively rich in quality. The significant decline in the diversity and, above all, the number of taxa of the macrozoobenthos groups, only at a depth of 10 m were found. In turn, the abundance (density and biomass) of the bottom fauna increased with depth of the site. The analysis of the increase in Oligochaeta abundance with depth suggests that at the level of about 4% of the organic matter content in the bottom sediments, the food conditions are no longer a factor limiting the Oligochaeta occurrence.
2018-01-30T00:00:00ZMacrozoobenthos structure in a temperate acid oligotrophic lakehttps://repozytorium.umk.pl:443/handle/item/5260
Macrozoobenthos structure in a temperate acid oligotrophic lake
Mimier, Daria; Godzich, Magdalena; Żbikowski, Janusz
The aim of the paper was to evaluate the structure of macrozoobenthos in acid, oligotrophic Jasne Lake. The basic abiotic parameters of water and bottom sediments were also studied. The samples were taken on five dates: 25.11.1997 and 13.05., 01.07., 7.08. and 21.10. in 1998. The sampling sites were located in four clearly different zones of the lake bottom at depths: 5 m, 10 m, 15 m and 19 m. The water transparency was very high (11 m) and water pH was extremely low (4.3). The oxygenation of the water near bottom was quite good up to a depth of 10 m. Generally both the water content (75.9% – 96.1%) and organic matter content (17.5% – 76.5%) in the bottom sediments were relatively high and increased with the depth. The taxonomic composition of the macrozoobenthos was similar to that of other acid water bodies, i.e. common, ubiquitous taxa dominated. Its species richness, diversity, and the density decreased as the depth increased but it is worth noting that the zone colonized by diverse and abundant macrozoobenthos extends to a depth of at least 10 m. The dominant group of benthic fauna at a depth of 5 m were Chironomidae larvae (almost 80% of the total macrozoobenthos density). At this station Ceratopogonidae and Sialis sp. larvae were also relatively numerous. In turn, at depths of 10 m and 15 m Asellus aquaticus (Isopoda) (43% and 57%, respectively) and Trichoptera larvae (37% and 21%, respectively) dominated. Among the chironomids Pseudochironomus sp. and Chironomus sp. larvae prevailed. The only taxa characteristic of acidic waters were Stylodrilus heringianus (Oligochaeta) and Ablabesmyia monilis (Chironomidae).
2018-01-30T00:00:00ZRzeczywista i potencjalna roślinność grodziska i podgrodzia w Grążawach oraz w ich najbliższym otoczeniuhttps://repozytorium.umk.pl:443/handle/item/4858
Rzeczywista i potencjalna roślinność grodziska i podgrodzia w Grążawach oraz w ich najbliższym otoczeniu
Cyzman, Wiesław; Kamiński, Dariusz
Tekst jest częścią interdyscyplinarnej publikacji dotyczącej wyników wieloletnich badań nad problematyką średniowiecznego osadnictwa w dorzeczu środkowej Drwęcy na przykładzie kompleksu osadniczego w Grążawach. Zawiera opis współczesnej roślinności rzeczywistej i model potencjalnej roślinności naturalnej w granicach zespołu osadniczego.
2017-01-01T00:00:00ZBioactivity Studies on Titania Coatings and the Estimation of Their Usefulness in the Modification of Implant Surfaceshttps://repozytorium.umk.pl:443/handle/item/4672
Bioactivity Studies on Titania Coatings and the Estimation of Their Usefulness in the Modification of Implant Surfaces
Radtke, Aleksandra; Topolski, Adrian; Jędrzejewski, Tomasz; Kozak, Wiesław; Sadowska, Beata; Więckowska-Szakiel, Marzena; Piszczek, Piotr
Morphologically different titania coatings (nanofibers (TNFs), nanoneedles (TNNs), and nanowires (TNWs)) were studied as potential biomedical materials. The abovementioned systems were produced in situ on Ti6Al4V substrates via direct oxidation processes using H2O2 and H2O2/CaCl2 agents, and via thermal oxidation in the presence of Ar and Ar/H2O2. X-ray diffraction and Raman spectroscopy have been used to structurally characterize the produced materials. The morphology changes on the titanium alloy surface were investigated using scanning electron microscopy. The bioactivity of the samples has been estimated by the analysis of the produced titania coatings’ biocompatibility, and by the determination of their ability to reduce bacterial biofilm formation. The photoactivity of the produced nanocoatings was also analyzed, in order to determine the possibility of using titania coated implant surfaces in the sterilization process of implants. Photocatalytic activity was estimated using the methylene blue photodegradation kinetics, in the presence of UV light.
2017-01-01T00:00:00ZBiocompatibility of Titania Nanotube Coatings Enriched with Silver Nanograins by Chemical Vapor Depositionhttps://repozytorium.umk.pl:443/handle/item/4671
Biocompatibility of Titania Nanotube Coatings Enriched with Silver Nanograins by Chemical Vapor Deposition
Piszczek, Piotr; Lewandowska, Żaneta; Radtke, Aleksandra; Jędrzejewski, Tomasz; Kozak, Wiesław; Sadowska, Beata; Szubka, Magdalena; Talik, Ewa; Fiori, Fabrizio
Bioactivity investigations of titania nanotube (TNT) coatings enriched with silver nanograins (TNT/Ag) have been carried out. TNT/Ag nanocomposite materials were produced by combining the electrochemical anodization and chemical vapor deposition methods. Fabricated coatings were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The release effect of silver ions fromTNT/Ag composites immersed in bodily fluids, has been studied using inductively coupled plasmamass spectrometry (ICP-MS). Themetabolic activity assay (MTT) was applied to determine the L929 murine fibroblasts adhesion and proliferation on the surface of TNT/Ag coatings. Moreover, the results of immunoassays (using peripheral blood mononuclear cells—PBMCs isolated from rats) allowed the estimation of the immunological activity of TNT/Ag surface materials. Antibacterial activity of TNT/Ag coatings with different morphological and structural features was estimated against two Staphylococcus aureus strains (ATCC 29213 and H9). The TNT/Ag nanocomposite layers produced revealed a good biocompatibility promoting the
fibroblast adhesion and proliferation. A desirable anti-biofilm activity against the S. aureus reference strain was mainly noticed for these TiO2 nanotube coatings, which contain dispersed Ag nanograins deposited on their surface.
2017-01-01T00:00:00ZOptimization of the Silver Nanoparticles PEALD Process on the Surface of 1-D Titania Coatingshttps://repozytorium.umk.pl:443/handle/item/4670
Optimization of the Silver Nanoparticles PEALD Process on the Surface of 1-D Titania Coatings
Radtke, Aleksandra; Jędrzejewski, Tomasz; Kozak, Wiesław; Sadowska, Beata; Więckowska-Szakiel, Marzena; Talik, Ewa; Mäkelä, Maarit; Markku, Markku
Plasma enhanced atomic layer deposition (PEALD) of silver nanoparticles on the surface
of 1-D titania coatings, such as nanotubes (TNT) and nanoneedles (TNN), has been carried out. The formation of TNT and TNN layers enriched with dispersed silver particles of strictly defined sizes and the estimation of their bioactivity was the aim of our investigations. The structure and the morphology of produced materials were determined using X-ray photoelectron spectroscopy (XPS) and scanning electron miscroscopy (SEM). Their bioactivity and potential usefulness in the modification of implants surface have been estimated on the basis of the fibroblasts adhesion and proliferation assays, and on the basis of the determination of their antibacterial activity. The cumulative silver release profiles have been checked with the use of inductively coupled plasma-mass spectrometry (ICPMS), in order to exclude potential cytotoxicity of silver decorated systems. Among the studied nanocomposite samples, TNT coatings, prepared at 3, 10, 12 V and enriched with silver nanoparticles produced during 25 cycles of PEALD, revealed suitable biointegration properties and may actively counteract the formation of bacterial biofilm.
2017-01-01T00:00:00ZThe Bioactivity and Photocatalytic Properties of Titania Nanotube Coatings Produced with the Use of the Low-Potential Anodization of Ti6Al4V Alloy Surfacehttps://repozytorium.umk.pl:443/handle/item/4669
The Bioactivity and Photocatalytic Properties of Titania Nanotube Coatings Produced with the Use of the Low-Potential Anodization of Ti6Al4V Alloy Surface
Radtke, Aleksandra; Topolski, Adrian; Jędrzejewski, Tomasz; Kozak, Wiesław; Sadowska, Beata; Więckowska-Szakiel, Marzena; Szubka, Magdalena; Talik, Ewa; Nielsen, Lars Pleth; Piszczek, Piotr
Titania nanotube (TNT) coatings were produced using low-potential anodic oxidation of
Ti6Al4V substrates in the potential range 3–20 V. They were analysed by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The wettability was estimated by measuring the contact angle when applying water droplets. The bioactivity of the TNT coatings was established on the basis of the biointegration assay (L929 murine fibroblasts adhesion and proliferation) and antibacterial tests against Staphylococcus aureus (ATCC 29213). The photocatalytic efficiency of the TNT films was studied by the degradation of methylene blue under UV irradiation. Among the studied coatings, the TiO2 nanotubes obtained with the use of 5 V potential (TNT5) were found to be the most appropriate for medical applications. The TNT5 sample possessed antibiofilm properties without enriching it by additional antimicrobial agent. Furthermore, it was characterized by optimal biocompatibility, performing better than pure Ti6Al4V alloy. Moreover, the same sample was the most photocatalytically active and exhibited the potential for the sterilization of implants with the use of UV light and for other environmental applications.
2017-01-01T00:00:00ZZNACZENIE GORĄCZKI I ENDOGENNEJ ANTYPIREZY. PERSPEKTYWA WYKORZYSTANIA INHIBITORÓW ROZPUSZCZALNEJ HYDROLAZY EPOKSYDOWEJ W FARMAKOLOGII PRZECIWGORĄCZKOWEJhttps://repozytorium.umk.pl:443/handle/item/4668
ZNACZENIE GORĄCZKI I ENDOGENNEJ ANTYPIREZY. PERSPEKTYWA WYKORZYSTANIA INHIBITORÓW ROZPUSZCZALNEJ HYDROLAZY EPOKSYDOWEJ W FARMAKOLOGII PRZECIWGORĄCZKOWEJ
Piotrowski, Jakub; Jędrzejewski, Tomasz; Pawlikowska, Małgorzata; Kozak, Wiesław
2017-01-01T00:00:00ZModern pollen data from Tuchola Foresthttps://repozytorium.umk.pl:443/handle/item/4639
Modern pollen data from Tuchola Forest
Filbrandt-Czaja, Anna
This paper compares pollen spectra derived from modified Tauber traps and moss samples adjacent to pollen traps from four sites different in type of vegetation and openness of the landscape in Tuchola Forest. The length of the pollen deposition period covered by an individual moss sample was a matter of discussion, as well as accumulated values of pollen grains in green gametophytes (A) and basal part of moss (B). Compared to pollen traps, mosses tend to accumulate more Pinus grains. The investigated moss samples (A+B) usually contain pollen from a period between one and two years. Pine, spruce, oak and beech pollen deposited more pollen almost always in the subsample A.
2017-08-25T00:00:00Z